<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <script>
        class Person {
            constructor(name, age) {
                this.name = name;
                this.age = age;
            }
            say() {
                console.log(this.name)
            }
        }
        class Teacher extends Person {
            constructor(name, age, sex) {
                super(name, age);
                this.sex = sex;
            }
        }
        let w = new Teacher("w", 20, "男");
        let w1=new Teacher("w", 20, "男","武汉");
        w1.say();
        console.log(w1);
    </script>
</body>

</html>